Why Your Aircon Is Not Cooling and How to Fix It

A hot and stuffy home is the last thing you need, especially during the sweltering summer months. Your aircon is not cooling, and you're not sure what to do.

First, let's talk about the obvious: a dirty air filter can cause your aircon to work harder, leading to reduced airflow and cooling performance. This is because a clogged filter restricts air from flowing through the system.

A faulty thermostat can also cause your aircon to malfunction. According to our article, a thermostat that's not calibrated correctly can lead to incorrect temperature readings, causing your aircon to either overheat or not cool at all.

If you've checked your thermostat and air filter, the next thing to check is the refrigerant levels in your aircon. Low refrigerant levels can cause your aircon to blow warm air, rather than cool it.

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Check the thermostat settings first. It's surprising how often a simple switch can be the culprit. Make sure it's set to "Automatic" and not "Fan", which will only blow air without cooling.

The thermostat is usually the first place to look for the issue. If you've checked the thermostat and it's not the problem, move on to the next step.

Check if the air conditioner is plugged in and the power cord is not damaged. A blown fuse or tripped circuit might also be the cause, so check those too.

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A malfunctioning thermostat is often the culprit behind an air conditioner not blowing cool air.

Check the thermostat settings to ensure it's set to cool.

Sometimes people accidentally switch the thermostat from "Automatic" to "Fan", so check that the switch is set to "Automatic."

A faulty thermostat can also be the reason, which might be due to a problem with the wiring or batteries.

If the thermostat is broken or not working correctly, it might not communicate well with your AC unit.

Check the temperature settings to ensure none of your home occupants has changed them.

If the thermostat is faulty, it's best to call in a technician to repair or replace it.

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It's easy to overlook something as simple as the power connection, but it's a crucial step in troubleshooting your air conditioner. A blown fuse or tripped circuit might also lead to the ac not cooling enough.

Make sure your air conditioner is plugged in and hasn't been knocked out. Sometimes, it's the simple things that might cause your aircon not blowing cold air.

Check that the power cord hasn't been damaged. A damaged power cord can prevent your air conditioner from working properly.

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Aircon not cooling? Don't worry, I've got you covered. Let's dive into some common issues that might be causing the problem.

Dirty air filters can reduce airflow, making your aircon work harder and less efficiently. This can lead to a decrease in cooling performance.

Ice or frost on the condenser or evaporator coil is a red flag. It's a sign that something's not right, and you should call an AC expert ASAP.

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Low refrigerant levels can cause the evaporator coil to freeze, making your aircon work even harder to cool your space. This can lead to more ice formations and a bigger problem on your hands.

Clogged condenser coils can also cause your aircon to overwork, leading to ice formations on the coil. It's essential to clean the condenser coils regularly to prevent this issue.

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Maintenance and cleaning are crucial for keeping your aircon running smoothly and efficiently. Regular cleaning can help prevent common issues like dirty condensers, clogged filters, and ice buildup on coils.

Dirty condensers can reduce airflow and cause your aircon to work harder, leading to increased energy bills and reduced cooling performance. To clean your condenser, use soap and water or a hose with gentle pressure, and make sure to cover it with a weatherproof cover when not in use.

Clogged filters can also restrict airflow and cause your aircon to overheat, leading to reduced cooling performance or even shutdown. It's recommended to replace or clean your filters every 30 to 90 days, depending on the pollution level in your area and usage.

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Here are some common issues and their corresponding cleaning solutions:

Regular maintenance can help prevent these issues and keep your aircon running smoothly.

Clearing the condensation drain is an essential part of air conditioner maintenance. It's a simple task that can help prevent costly repairs and keep your AC running efficiently.

The condensation drain hose directs moisture from the air conditioner to a floor drain or outside the home. However, it's prone to clogging by mold and algae growth. This can cause your air conditioner to stop blowing cold air or shut down completely.

To clear a clog, locate the end of the condensation drain line, usually in a utility room, and visually inspect it for blockages. Use a small screwdriver or similar narrow item to carefully clear out any clogs you find.

If the clog is higher in the line and out of reach, you can use a wet/dry shop vacuum to create suction and remove the blockage. Hold your hands around the opening to create a seal between the two hoses.

After clearing a clog, pour a couple of cups of white vinegar into the condensation pan beneath the evaporator coils in the inside blower unit. This will help kill residual mold buildup and reduce the risk of future clogs.

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Cleaning dirty coils is a crucial part of air conditioner maintenance. The coils, located in both the outdoor compressor unit and indoor blower unit, can become dirty or covered with mold and debris, reducing cold air output. You can clean the coils yourself, but it's essential to follow the manufacturer's directions and take necessary safety precautions.

To clean the coils, start by shutting off the power to both the exterior and interior units at the breaker panel. Each unit will be on a separate breaker. Next, remove the metal enclosures that protect the coils, following the manufacturer's instructions. For interior coils, use a non-rinse evaporator coil cleaner, such as Nu-Calgon Evap Foam No Rinse, and spray it onto the coils. For exterior coils, use a condenser coil cleaner, such as Nu-Calgon's Nu-Blast Condenser Coil Cleaner, and spray it onto the coils and surrounding metal fins.

Dirty coils can cause ice buildup, which can be a sign of a larger issue. In fact, ice buildup on the coils can be a result of low refrigerant levels or a malfunctioning thermostat. If you notice ice buildup, it's essential to address the issue promptly to prevent further damage to your air conditioner.

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Here's a quick checklist to help you clean your air conditioner coils:

Remember, cleaning dirty coils is a relatively easy DIY task, but if you're not comfortable with the process, it's always best to hire a professional to do the job. Regular coil cleaning can help improve your air conditioner's efficiency, reduce energy bills, and extend its lifespan.

Your air conditioner may be experiencing advanced problems if it's not blowing cold air. This could be due to a faulty compressor, which is a major component responsible for cooling the air.

A malfunctioning thermostat can also cause issues, as it may not be able to sense the temperature correctly. This can lead to the aircon not cooling properly.

A clogged air filter can reduce airflow and cause the aircon to work harder, leading to increased energy bills and reduced cooling efficiency. It's essential to check and replace the air filter regularly.

A refrigerant leak can cause the aircon to lose its cooling capacity, leading to poor performance.

If your air conditioner still isn't cooling after trying the DIY steps, it's time to call a professional. They can diagnose and fix the problem, and it's especially important if you suspect a refrigerant leak or a failed compressor unit.

A licensed HVAC professional is necessary to handle refrigerants, which are federally regulated. You can't replace them yourself, so don't try to tackle this issue on your own.

If your AC system is more than 10 years old, a failed compressor might be the culprit. In this case, it's likely you'll need to purchase a new system.

Here are some signs that you need to partner with the experts:

If you've checked all these potential issues and your air conditioner still isn't cooling, it's time to call a reliable HVAC company to diagnose and fix the problem.